Of same place



(No Model.)

G. W. DRUMHELLER 87 C. H. NORTH. MACHINE POR CUTTING GEARS.

No. 409,776. Patented Aug. 27,1889.'

HIM-

hun

UNITED STATES PATENT OFFICE.

GEORGE WV. DRUMHELLER AND CHARLES H. NORTH, OF CLEVELAND, OI-IIO, ASSIGNORS OF ONE-HALF TO STANDISH M. YORK, OF SAME PLACE.

MACHINE FOR CUTTING GEAR.

SPECIFICATION forming part of Letters Patent No. 409,776, dated August 27, 1889.

Application filed December l, 1888. Serial No. 292,420. (No model.)

To all whom it may concern.-

Beit known that we, GEORGE lV. DRUM- HELLER and CHARLES I-I. NORTH, citizens of the United States, and residents of Cleveland, in the county of Cuyahoga and State of Ohio, have invented certain new and useful Improvements in Gear-Cutting Machines, of which the following is a specification.

This invention relates to machines for cutting gear-teeth and it consists in the peculiar construction and combination of parts, as hereinafter fully described, and pointed out in the claims.

In the accompanying drawings, Figure lis a top or plan view. Fig. 2 is a side elevation, and Fig. 4 is an end elevation, of our new gear-cutting machine. Fig. 4 is a vertical section on line et 4f on Fig. 2. Fig. 5 is a sectional view of cutting-tool holder and part of a gear-wheel, showing the manner of cutting the teeth.

A represents a standard and base, which support all of the working parts of our machine, to the front end of which is provided a slotted projection A2, having a bore for carrying a vertical spindle B. The lower portion of said spindle is screw-threaded, and in the slot a is placed a.hand-whecl nut C, in which the said spindle plays. The bore through the projection A2 is not screwthreaded.

D is an index feed-wheel liked on thc spindle, having a hub in which a feather or setscrew d is placed, which iits in a longitudinal groove b in the spindle. The top end of this spindle carries the blank-wheel to be eut, and

and its hub is titted to turn between the two proj eetions A2 and A3.

E is a slotted plate lying on the top of the standardA. Its forward end is provided with box-bearings e e for counter-shaft F. This plate is held by means of a screw E2, passed through the slot and screwed into the top of the standard A. At its rear end is also provided a screw G, passed through a lug g on the top ofthe standard A, and has two nuts g2 gS-one at each side of the said lug g-the purpose of which is to provide for nice adjustment of the cutting-tool held in the shaft 5 5 F to its work. On one end of the shaft F is placed a cone driving-pulley P. On the opposite end of the shaft F is fixed a grooved crank-disk H, holding an adjustable wristpin p, to which is attached a pitman I. 6o

On the side of the standard A and to a rear projection thereof are attached slidebearings J J, in which a sliding bar K is set. These bearings have adj ustment-screws jj. To a slotted projection k on said bar K is attached an adjustable wrist-pin 172, to which the pitman I is attached.

To the forward end of the sliding bar K is attachedapawl L, whose forward end engages with the serrated edge ot' the index-wheel D. 7o A light spring Z in the heel of the pawl serves to keep the end of the pawl in contact with the wheel D.

f is the cutting-tool set in a hole through the shaft F, and is secured therein by means of a set-screw s. This tool is so made and set that one end will face the edge of the wheel while the other end cuts the tooth in the edge.

The operations of this machine are as follows: The blank to be cut is spcured onto the 8o disk B2 by a nut a, and the plate E is adjusted so as to bring the shaft and its cutting-tool up to the edge of the blank. The feed is also adjusted by setting the wrist-pin Ap in the disk H and the wrist-pin 7a2 in the sliding 85 plate bar K to the required points for giving the necessary play to said sliding bar for operating the pawl L, which moves the index feed-wheel D. This adjustment is determined by the number of teeth desired for the 9o gear-wheel to be cut. Having thus adjusted these parts of the machine, the spindle is run down by turning the hand-wheel nut C so that the rotating cutter will just reach the top edge of the blank. The machine may now be putin motion. The rotating cutter now begins its work by cutting the upper edge of the blank into little curved notches, as seen atm on Fig. l. At each revolution of the cutter-shaft the feed-wheel is also ico moved, which turns the blank the width of the tooth to be cut, so that these notches are cut in rapid succession as the said blank is turned. When the blank has turned once around, it has been fed upward by the spindle B turning in the nut C. Then as the spindle continues to turn the rotary cutter cuts the notches deeper down the periphery of the blank,`and so on as the blank is fed upward the teeth are gradually cut in the said periphery. The index feed-Wheel D brings the notches previously cut squarely opposite the cutting-tool, so that the teeth are cut gradually through from the upper to the lower side of the blank, as seen in the diagram, Fig. 5, the tool movingin the direction indicated by the arrow. Thus the bottoms of the spaces between the teeth are cut straight across, as- Well as the outer edges of the teeth. It will be seen that it makes no difference what the thickness of the blank may be, the teeth are all cut alike, and, if desired, two or more blanks might be placed one above another on the disk B2 and all cut before removing them, thereby facilitating the Work.

Having described our invention, What We claim, and desire to secure by Letters Patent, 1s-

1. In combination, the vertical spindle B, supported in bearings A2 A3 of standard A and having blank-holder B2, and the rotating shaft F, having cutting-tool f and journaled in bearings e e of adjustable plate E, which is provided with clamping-screw E2, and the adjusting-screw G and nuts g g, by Which said shaft and cutting-tool may be adjusted for cutting different sizes of gear-Wheels.

2. The combination, With the rotating shaft F, of t-he cutting-tool f, having one end provided With square cutting-edge for facing the periphery, and the other end provided with end and side cutting-edges for cutting teeth in the periphery of the blank, substantially as specified.

3. In combination, the spindle B, supported in bearings A2 A3 on standard A, and having the index-Wheel D attached, also having the hand-Wheel nut C attached and located between the bearings A2 A3, the spindle being screw-threaded, so that When rotated by the index-Wheel it Will also be moved upward through said nut, substantially as and for the purpose speciiied. 1

4t. The combination, with the spindle B, supported in bearings A2 A3 of the standard A and provided With in dex-Wheel D and nut C, of the rotary shaft F, having the crankdisk H attached, the pitman I, connecting said disk H With sliding bar K, playing in bearings J J on the side of the standard and having pawl L engaging with the index-Wheel D, for imparting intermittent rotative motion to the spindle, substantially as and for the purpose specified.

5. The combination, with standard A, of the adjustable plate E, provided With the bearings c e Jfor the rotating tool-holding shaft F, having the crank-disk H, and the pitman I, adjustably connected With the sliding bar K, playing in the bearings J J on the side ofthe standard A and provided With pawl L, engaging with the index-Wheel D, whereby the tool-holding shaft may be adjustably set in relation to the blank-holder, substantially as described, and for the purpose speciiied.

GEO. NV. DRUMHELLER. CHAS. H. NORTH. l/Vitnesses:

GEO. XV. TIBBITrs, GEO. A. TIsDALE. 

